我正在尝试在Xamarin的Android应用程序中显示地图，但是当我尝试查看地图时遇到了问题：
12-11 11:11:33.122 E/Google Maps Android API( 1254): Authorization failure.
Please see https://developers.google.com/maps/documentation/android-api/start for how to correctly set up the map.
12-11 11:11:33.126 E/Google Maps Android API( 1254): In the Google Developer Console (https://console.developers.google.com)
12-11 11:11:33.126 E/Google Maps Android API( 1254): Ensure that the "Google Maps Android API v2" is enabled.
12-11 11:11:33.126 E/Google Maps Android API( 1254): Ensure that the following Android Key exists:
12-11 11:11:33.126 E/Google Maps Android API( 1254): API Key: .....
12-11 11:11:33.126 E/Google Maps Android API( 1254): Android Application (<cert_fingerprint>;<package_name>): .....;.....
我检查API是否已启用，但我不知道问题是什么。